package com.dongqi.myblog.util;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
 * MD5加密
 */
public class MD5Utils {

    /**
     * MD5加密
     * @param str 要加密的字符串
     * @return 加密后的字符串
     */
    public static String code(String str){
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            md.update(str.getBytes());
            byte[] byteDigest = md.digest();
            int i;
            StringBuffer buf = new StringBuffer("");
            for(int offset = 0;offset<byteDigest.length;offset++){
                i=byteDigest[offset];
                if (i<0){
                    i+=256;
                }
                if (i<16){
                    buf.append("0");
                }
                buf.append(Integer.toHexString(i));
            }
            //32位加密
            return buf.toString();
            //16位加密
            //return buf.toString().substring(8,24);
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
            return null;
        }
    }

}
